196 results about "Intergranular corrosion" patented technology

The invention discloses a corrosion-resistant aluminum alloy profile and a preparation method thereof, and belongs to the technical field of aluminum alloy profiles. By optimizing the components of the corrosion-resistant aluminum alloy, the strength of the aluminum alloy profile can be guaranteed, and the corrosion resistance of the aluminum alloy profile is positively influenced. Besides, the corrosion-resistant coating is formed on the surface of the corrosion-resistant aluminum alloy base material in a laser cladding mode, the corrosion resistance of the aluminum alloy profile can be remarkably improved while the application performance of the aluminum alloy profile is guaranteed, and in the corrosion-resistant coating, nickel powder can enhance pitting corrosion resistance and intergranular corrosion resistance, so that the corrosion resistance of the aluminum alloy profile is improved. The adhesive force with an aluminum alloy base material is improved; the boron nitride can improve the acid resistance and wear resistance of the surface of the aluminum alloy profile and block a corrosion channel; the lanthanum oxide and the cerium dioxide have a synergistic effect, so that surface grains can be refined, air holes generated in the cladding process are reduced, the compactness of the coating is improved, the compatibility with an aluminum alloy base material is promoted, and the apparent quality of the aluminum alloy profile is guaranteed.

The invention discloses a production method of a T2+Q355B copper steel rolled composite plate. The technological process comprises the steps of assembling, heating, rolling, stack cooling, finishing, flaw detection and warehousing. A T2 + Q355B copper steel rolled composite plate with excellent bonding strength, mechanical property and conductivity is obtained by adopting a vacuum rolling composite technology, a symmetric assembly technology and a low-speed deformation technology and utilizing wide and thick plate production line equipment and technical advantages, the thickness of a base material ranges from 5 mm to 40 mm, the thickness of a composite layer ranges from 1 mm to 20 mm, the width is smaller than or equal to 3600 mm, the yield strength is larger than or equal to 250 Mpa, the tensile strength ranges from 350 Mpa to 600 Mpa, the shear strength is larger than or equal to 120 Mpa, and the composite layer T2 copper conductivity IACS is larger than or equal to 85%. The intergranular corrosion crack rate is 0. The product can be widely applied to the fields of high-voltage electric appliances, ship manufacturing, new energy equipment and the like, and has the potential of replacing traditional products.

The invention relates to the technical field of pressure vessel health monitoring and nondestructive testing, in particular to an electromagnetic acoustic surface wave-based pressure vessel intergranular corrosion non-contact detection system, which comprises the following modules: a multi-field coupling electromagnetic acoustic surface wave detection module, which comprises a plurality of detection unit arrays, each detection unit comprises a magnetic biasing module and an impedance matching module and is used for generating a local magnetic field on the surface of the pressure vessel and optimizing signal excitation and receiving; and the signal acquisition and preprocessing module is used for acquiring the surface wave signal of the detection module and carrying out denoising, filtering, curved surface coupling difference correction and lift-off correction on the signal to obtain high-quality signal data. According to the method, non-contact quantitative detection of the intergranular corrosion of the pressure vessel is realized through multi-field coupling electromagnetic acoustic surface wave detection and microscopic and macroscopic mapping and inversion, so that the problem that early corrosion is difficult to quantify due to the fact that contact ultrasound is mostly adopted in traditional pressure vessel detection and grain boundary micro-damage cannot be effectively identified is solved.

The invention relates to the technical field of petrochemical equipment, and discloses a Ni-Cr-Mo corrosion-resistant alloy seamless tube for petrochemical equipment and a manufacturing method, the seamless tube comprises the following components: C < = 0.01%, Si < = 0.05%, Mn < = 0.30%, P < = 0.015%, S < = 0.005%, 22.2-24.0% of Cr, 16.0-17.0% of Mo, T < = 0.10%, A < l > < = 0.30%, 1.3-1.9% of Cu, Co < = 0.50%, Fe < = 1.5%, Nb < = 0.10%, W < = 0.40%, N < = 58.0%, and the sum of the components is 100%. By accurately controlling the proportion of alloy components and strictly limiting the contents of elements such as carbon, silicon, phosphorus and sulfur, key elements such as chromium, molybdenum and nickel are reasonably blended. Wherein the carbon content is strictly controlled not to exceed 0.01%, so that the precipitation of carbides is effectively avoided, and the intergranular corrosion resistance is improved; and the chromium content is controlled to be 22.2-24.0%, so that the oxidation resistance and the corrosion resistance are enhanced. All the elements have a synergistic effect, so that the alloy seamless tube has high strength, good toughness and excellent corrosion resistance, and can stably work in a high-temperature and high-pressure petrochemical environment accompanied by a strong corrosive medium.

The invention discloses a neutral organic chelating cleaning agent for a boiler, and belongs to the field of chemical cleaning of boiler superheaters of thermal power plants. The cleaning agent is prepared from the following components in percentage by weight: 0.5%-5% of ethylenediamine tetraacetic acid ammonium, 0.1%-4% of acetic acid or ammonium acetate, 0.1%-3% of glycollic acid ammonium or glycollic acid, 0.1%-5% of a pH regulator, 0.1%-1% of a cosolvent, 0.2%-0.8% of a corrosion inhibitor SH369, 0.1%-0.6% of a reducing agent, 0.0%-0.3% of a defoaming agent, 0.0%-0.2% of a surfactant and 84%-93% of water, wherein the pH value of the cleaning agent is 6-8; the cosolvent is tartaric acid and / or hydroxybutyl diacid, the surfactant is nonylphenol polyoxyethylene ether, and the reducing agent is hydrazine. The cleaning agent disclosed by the invention has good dissolving capacity on oxide skin, does not generate precipitates to cause pipe blockage, is a neutral solution, is very small in corrosivity, does not generate intergranular corrosion, is beneficial to protecting various pipes of superheaters and reheaters, and is a safe and efficient superheater cleaning agent.

The invention relates to the technical field of high-temperature alloy materials, and provides an N10276 profiled bar and a forming method thereof.The surface of a blank is coated with a three-layer composite sheath, the blank is heated in a partitioned and gradient mode, the temperature of a side wing plate area is 50-100 DEG C higher than that of a web plate area, the metal fluidity of a side wing plate is improved, cogging rolling, four-roller reciprocating finish rolling, partitioned and gradient cooling and secondary solution treatment are conducted, and the N10276 profiled bar is obtained. A nitric acid and hydrofluoric acid mixed solution is used for pickling and stripping the composite sheath, an oxide layer is removed, intergranular corrosion is avoided, a triple sheath synergistic protection mechanism is adopted, oxygen is physically isolated by outer stainless steel, and heat loss is inhibited by a middle yttria-stabilized zirconia ceramic fiber layer.

The application discloses a kind of corrosion-resistant aluminum alloy profiles and preparation method thereof, belong to aluminum alloy profile technical field.The application can ensure the strength of aluminum alloy profile by optimizing the composition of corrosion-resistant aluminum alloy, and has a positive effect on the corrosion resistance of aluminum alloy profile.In addition, the application forms a corrosion-resistant coating on the surface of the corrosion-resistant aluminum alloy substrate by laser cladding, which can significantly improve the corrosion resistance of the aluminum alloy profile while ensuring the application performance of the aluminum alloy profile.In the corrosion-resistant coating, nickel powder can enhance the resistance to pitting and intergranular corrosion, and improve the adhesion to the aluminum alloy substrate.Boron nitride can improve the surface acid resistance and wear resistance of the aluminum alloy profile, and block the corrosion channel.Lanthanum oxide and cerium dioxide have a synergistic effect, which can refine the surface grains, reduce the pores generated during the cladding process, improve the compactness of the coating, promote the compatibility with the aluminum alloy substrate, and ensure the appearance quality of the aluminum alloy profile.

The invention discloses a method for improving intergranular corrosion resistance of a 6013 aluminum alloy. The method comprises the following steps that the 6013 aluminum alloy is sequentially subjected to solution treatment, quenching, pre-aging treatment and secondary aging treatment. According to the method, the strength of the 6013 aluminum alloy is not affected while the intergranular corrosion resistance of the 6013 aluminum alloy is improved, the industrial production requirement is completely met, and the method is suitable for large-scale industrial application.

The application discloses an intermediate processing liquid for an electroless nickel immersion gold (ENIG) production line and a chemical gold preparation method. The intermediate processing liquid is applied between the electroless nickel plating and immersion gold processes, and comprises (a) a pH buffer and a metal ion complexing agent: a total concentration of 50-150 g / L; (b) an adsorptive corrosion inhibitor: a concentration of 0.5-5.0 g / L; (c) a low-foam non-ionic surfactant: a concentration of 0.01-10 g / L; (d) an auxiliary antioxidant: a concentration of 0.5-30 g / L; (e) a dissolving agent: a concentration of 1-50 ml / L; (f) a pH regulator: an appropriate amount, which is added to maintain the pH value of the intermediate processing liquid at 4.0-6.5; and (g) deionized water: a balance, so that the concentrations of the above components reach the set target values; and the intermediate processing liquid has a design use temperature of 20-45 DEG C. The intermediate processing liquid removes residual nickel ions on the board surface and in micropores through strong complex cleaning, and blocks the pollution to the subsequent gold tank; meanwhile, the preferential adsorption of the corrosion inhibitor molecules at the nickel layer grain boundaries forms a controllable molecular-level protective film, effectively adjusts the immersion gold replacement reaction kinetics, and prevents the occurrence of intergranular corrosion (black plate).

The invention relates to a method and a product for regenerating and repairing duplex stainless steel, the duplex stainless steel is used for a nuclear-grade main pipeline, pulse current with optimized parameters is adopted to treat the duplex stainless steel in the nuclear-grade main pipeline with pitting corrosion or intergranular corrosion generated in the service process, the corrosion resistance of the duplex stainless steel is recovered, and dynamic self-repairing of a passive film is achieved. According to the method, pulse current in-situ / near-in-situ treatment is carried out on the duplex stainless steel for the nuclear-grade main pipeline under the electric-thermal coupling condition, components do not need to be disassembled or large-volume furnace heating does not need to be carried out, and the structure and geometric accuracy of a casting are not changed; by selecting matched parameters such as pulse frequency, pulse width, current density and treatment time, an amplitude-modulated decomposed structure in a ferrite phase and a phase interface precipitated phase are promoted to be re-dissolved, the formation dynamics and stability of a passive film are improved, and the corrosion resistance and toughness of an aged material are recovered or close to an unaged state.

The invention relates to the technical field of laser welding, in particular to a water curtain cooling stainless steel pipe intelligent laser welding device which comprises a machine body, and a welding mechanism is arranged on the machine body and used for stainless steel pipe welding machining. The water curtain assembly comprises a lower ring frame fixed to the outer wall of the lower end of the laser welding device, L-shaped supports are pivoted to the outer walls of the left end and the right end of the lower ring frame, round sleeves are fixed to the outer ends of the L-shaped supports, nozzles are installed in the round sleeves in a penetrating mode, an upper ring frame is fixed to the outer wall of the upper end of the laser welding device, and first air cylinders are pivoted to the outer walls of the left end and the right end of the upper ring frame. The lower output end of the first cylinder is pivoted with the upper end of the L-shaped bracket; the welding seam is precisely covered and rapidly cooled through the dynamically adjusted flat water curtain, the intergranular corrosion tendency is remarkably restrained, welding deformation is reduced, meanwhile, air is isolated to improve surface oxidation, and the corrosion resistance, the size precision and the appearance quality of a connector are comprehensively improved.

The invention discloses a corrosion-resistant rolled composite steel plate for medium-temperature equipment and a manufacturing method of the corrosion-resistant rolled composite steel plate. The composite steel plate comprises a base material, a composite layer and a transition layer between the base material and the composite layer, the base material is prepared from, by weight, 0.01%-0.15% of C, 0.2%-0.7% of Si, 0.1%-1.70% of Mn, 0.006%-0.025% of Ti, 0.004%-0.015% of Als, 0.0010%-0.050% of Nb, 0.15%-0.50% of V, 0.0005%-0.0050% of B, 0.0015%-0.0050% of N, smaller than or equal to 0.0165% of P, smaller than or equal to 0.010% of S, smaller than or equal to 0.005% of O and the balance Fe and other inevitable impurities. By blocking or reducing diffusion of carbon elements on the base material carbon steel side at the interface of the composite steel plate, the possibility of failure caused by intergranular corrosion of stainless steel on the composite layer side is reduced, the corrosion resistance and safety performance of the rolled composite steel plate are comprehensively improved, and the composite steel plate is suitable for 300-450 DEG C medium-temperature equipment in the field of energy manufacturing of petroleum refining, coal chemical industry and the like.

The invention relates to the technical field of pressure vessel intergranular corrosion detection, in particular to a nonlinear ultrasonic guided wave detection method for pressure vessel intergranular corrosion. The system comprises a signal generation and emission module, a signal acquisition and preprocessing module, a feature extraction and analysis module, a damage positioning and evaluation module, an optimization and calibration module and a data storage and visualization module. According to the invention, through cooperative work of the multi-band excitation signal and the distributed sensor array, the detection sensitivity and resolution are significantly improved; a nonlinear characteristic matrix and a multi-level decomposition capture material nonlinear effect are utilized to realize accurate positioning and evaluation; an adaptive parameter adjustment mechanism simplifies the operation process and reduces the detection cost; and a cloud database and a graphical interface are convenient for result storage and analysis. The intergranular corrosion can be efficiently and reliably detected, and a scientific basis is provided for the industrial field.

The utility model discloses a kind of grinding devices of electrostatic contact, belong to grinding processing equipment technical field, the grinding device includes the clamping assembly for clamping electrostatic contact, first station is equipped on clamping assembly, hot shrink tube is placed on first station, hot shrink tube is inserted for the clamping part of electrostatic contact, air gun assembly is equipped on clamping assembly, air gun assembly can spray high-temperature hot gas, when clamping assembly moves to the clamping part of electrostatic contact, air gun assembly is spirally rotated with hot shrink tube as center, so that hot shrink tube is heat-shrunk and tightened and the clamping part of electrostatic contact is connected, to when clamping assembly clamps the clamping part of electrostatic contact, clamping assembly is clamped on heat-shrunk and tightened hot shrink tube.The utility model makes grinding fluid permeability zero by heat shrink tube sealing, radically cure intergranular corrosion, simultaneously, realize micro-newton level flexible clamping by heat shrink tube buffer, avoid clamping damage, and pass through the heating mode of spiral heating and end portion reinforcement to guarantee sealing property.

The invention discloses a steel plate, a hot stamping part and a preparation method and application thereof, and belongs to the technical field of alloy materials, the hot stamping part comprises an oxide layer, an alloy layer and a steel matrix, and the alloy layer is located between the oxide layer and the steel matrix; in the alloy layer, the phase proportion of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 80%, and the occurrence frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% is larger than or equal to 1%. In addition, the invention further discloses a steel plate component and a preparation method of the hot stamping part and a hot forming process of the hot stamping part. According to the method, the LME resistance of the Fe content in the alloy layer is improved, meanwhile, the crystal configuration of the plating layer is regulated and controlled, the frequency of the coincidence lattice grain boundary sigma 3 of the phase with the Fe content of 45 wt.%-95 wt.% in the zinc-iron alloy layer is improved, and the corrosion resistance of a hot forming part is considered while the LME resistance is achieved by means of the good intergranular corrosion resistance of the coincidence lattice structure.

The invention discloses a duplex stainless steel base metal layered surfacing welding process, which adopts a surfacing welding machine to build up a nickel-based alloy welding material on a duplex stainless steel base metal in a gas shielded welding state, and specifically comprises the following steps: controlling the temperature of the base metal before welding, controlling the preheating temperature between 10 DEG C and 20 DEG C, and adopting a multi-layer welding mode according to the structure and use requirements of the base metal, the method comprises the following steps: firstly, carrying out surfacing on a first layer, then sequentially carrying out surfacing on a next layer, and when the interlayer temperature reaches 145-150 DEG C and the interlayer temperature is reduced to 28-32 DEG C by using a cooling device, carrying out surfacing again, adopting an S31803 material as a duplex stainless steel base material, and adopting an ERNiCrMo-3 argon arc welding wire as a nickel-based alloy welding material. By means of the method, welding of the nickel-based alloy and the duplex stainless steel can be achieved, on the basis that the corrosion resistance of the duplex stainless steel is guaranteed, the material abrasion resistance is improved, the percent of pass of a surfacing layer is increased, the problems of hot cracks, air holes, intergranular corrosion of a welding joint and the like in the welding process of the nickel-based alloy and the high-strength steel are solved, and the welding quality and the use performance are guaranteed.

The invention is suitable for the technical field of metal material processing, and provides a preparation method and application of an aluminum alloy welding wire, and the method comprises the following steps: step 1, preparing an aluminum magnesium alloy melt, adding a nucleating agent with a twin crystal structure, and casting into an aluminum magnesium alloy cast ingot; and 2, the prepared cast ingot is subjected to hot extrusion, a wire blank is prepared, and the aluminum alloy welding wire is prepared by adopting multi-pass drawing and gradual fine drawing. The method specially aims at grain boundary regulation and control of the welding joint, and a new thought is provided for preparing the high-strength corrosion-resistant aluminum alloy welding wire. The aluminum alloy welding wire using the method is used for fusion welding of aluminum alloy, and the grain structure of a welded joint contains high-density twin boundaries. Compared with a conventional welding joint, the joint containing the high-density twin boundaries not only has higher hardness, but also can keep good intergranular corrosion resistance in the long-term service process.

The application belongs to the technical field of nickel alloy manufacturing, and particularly relates to a kind of wear-resistant and corrosion-resistant nickel-based alloy material and a preparation method thereof, the nickel-based alloy material is sintered from Ni-Cr-Mo pre-alloy powder, Co powder, Ta powder, rare earth oxide powder, titanium sponge powder and core-shell structure reinforcing phase, the reinforcing phase adopts the core-shell structure of Ni-Mo coated silicon carbide-graphite, which is used to eliminate heterogeneous interface pores and in-situ anchor effectively to prevent particle peeling, and effectively block the malignant outward diffusion of carbon atoms to protect the intergranular corrosion resistance of alloy matrix, the nickel-based alloy material is purified by in-situ deoxidization, carbide interface is anchored effectively, and the corrosion-resistant hardening of core-shell reinforcing phase, a high-bonding composite reinforcement network is built inside, the problem of intergranular corrosion caused by heterogeneous phase peeling and carbon diffusion is solved, and efficient combination of high metallurgical density, lubrication and corrosion resistance is realized.

The invention provides an ultralow-carbon stainless steel flux-cored wire protected by mixed gas, and belongs to the field of welding materials. The invention provides an ultralow-carbon stainless steel flux-cored wire protected by mixed gas. A flux core of the ultralow-carbon stainless steel flux-cored wire comprises the following components in percentage by weight: 1-8% of Mn; 0.1%-1% of Si; 25 to 40 percent of Cr; 15%-30% of Ni; the total amount of Na2O and K2O is 1-7%; 0-1% of fluoride; 1 to 6 percent of TiO2; 8%-15% of SiO2; 4 to 16 parts of ZrO2; 1 to 5 parts of MnO; and the balance of Fe. And the filling rate of the flux core is 24-32%. According to the flux-cored wire, the problems that an existing stainless steel flux-cored wire is many in weld oxidation color, unattractive in weld joint, difficult in deslagging and poor in gas hole sensitivity are solved, welding is conducted under the condition of 80% Ar + 20% CO2 mixed gas, and deposited metal obtained after welding has the tensile strength larger than or equal to 520 Mpa and the ductility larger than or equal to 25%. As a welding material for dissimilar steel butt joint and low alloy steel surface surfacing, good welding process performance, stable electric arc, no splashing and attractive weld joint forming are guaranteed, and it is guaranteed that welded metal has excellent intergranular corrosion performance.

A kind of Al-Mg-Mn-Zn-Er-Zr aluminum alloy plate welding joint preparation method suitable for low temperature corrosion service environment belongs to the field of welding.It includes the following steps: selecting warm rolling state Al-Mg-Mn-Zn-Er-Zr aluminum alloy plate as base material, matching specific component ER5E61 welding wire; the area to be welded is designed, mechanically polished and "alkali washing-acid washing"; under inert gas protection, using "primer-filling-capping" multi-layer multi-pass welding process, implementing gradient heat input in different passes; after welding, low temperature annealing treatment is carried out.The present application solves the problems of incomplete penetration, pore enrichment and low temperature brittleness during the welding of plate, the internal weld reaches the I level standard, the joint intergranular corrosion nitric acid weight loss value is less than 15mg / cm2, the strength and toughness of the joint at 77K low temperature is improved, the elongation after fracture is greater than or equal to 9.0%, and the fracture mode is changed to mixed fracture dominated by toughness.

The present invention relates to the technical field of soldering, and in particular, to a self-fluxing soft solder and its preparation method and application. The self-fluxing soft solder mainly consists of a tin-based solder and a soldering flux with a mass ratio of 75-94:6-25; wherein, the tin-based solder is mainly made of the following components by mass percentage: 7%-9% of Sb, 4%-6% of Cu, 0.2%-2% of Ni, and the balance is Sn; the soldering flux includes zinc chloride and / or ammonium chloride. The melting point of the self-fluxing soft solder is 230-250°C, which completely avoids the sensitization temperature range of stainless steel and the problem of intergranular corrosion after soldering; at the same time, this soft solder can greatly improve the shear strength of the joint after soldering; using this soft solder does not require additional addition of a soldering flux and can be directly soldered.

This invention relates to the field of stainless steel materials technology, specifically to a nickel-chromium-molybdenum-containing marine splash zone-resistant and corrosion-inhibiting stainless steel material and its preparation process. The chemical composition of the stainless steel material, by mass percentage, includes: carbon ≤0.04%, silicon 0.5%-0.8%, manganese ≤0.8%, phosphorus ≤0.02%, sulfur ≤0.0015%, chromium 22%, nickel 10%-11%, molybdenum 3.0%-3.5%, copper 1.2%-1.5%, titanium 0.2%-0.25%, niobium 0.1%-0.15%, with the remainder being iron. This invention's stainless steel material, through scientific chemical composition design, constructs a stable basic corrosion-resistant system. Simultaneously, the introduction of specific elements exerts a synergistic effect, effectively enhancing the stability and density of the passivation film on the material surface. This significantly improves the material's resistance to pitting corrosion in marine splash zones, reduces the risk of chloride ion damage to the passivation film, effectively inhibits intergranular corrosion, greatly improves the material's corrosion resistance stability, and extends its service life in harsh marine environments.

The utility model belongs to the technical field of metallurgical equipment, particularly relates to material proportioning equipment for austenitic stainless steel intergranular corrosion resistance production, and provides the following scheme aiming at the problems of insufficient proportioning precision and serious impurity residue in the background technology: the material proportioning equipment comprises a bracket, and a double-screw conveyor is arranged on the outer wall of the top of the weighing table. The double-screw conveyor is linked with the weighing platform, the weight of materials is fed back to the PLC electric control cabinet in real time, the conveying speed is dynamically adjusted, and the matching error of key elements such as Cr and Ni is reduced. The design of the material supplementing pipe and the material distributing pipe supports multi-batch trace adding, component fluctuation caused by one-time feeding is avoided, the screen can intercept large-particle impurities, the electromagnetic iron remover adsorbs metal chippings through a high-intensity magnetic field, and the impurity removal rate is increased. And the top tank and the bottom hopper are designed in a split manner, so that the screen and the electromagnetic iron remover are convenient to clean regularly, the maintenance is convenient, and continuous production is not influenced.

The invention provides steel for a high-strength and high-corrosion-resistance chromium-titanium photovoltaic support and a preparation method of the steel, and belongs to the technical field of metal material preparation. The high-strength, high-toughness and high-corrosion-resistance steel for the chromium-titanium photovoltaic bracket is obtained through smelting, casting, forging and rolling in a vacuum induction furnace; according to the method, vacuum induction furnace two-stage titanium adding is combined with the high-purity argon stirring and composite deoxidation slagging technology, the titanium element yield and the oxygen content in steel are accurately controlled, and finally the purity of the molten steel w (T.O) is smaller than or equal to 40 ppm; through the dynamic recrystallization regulation and control technology in the multidirectional forging and temperature control rolling process, high-density uniform distribution of nanoscale (Ti, Cr) C precipitated phases larger than or equal to 3 * 10 < 15 > / m < 2 > is achieved; the yield strength of the prepared steel for the chromium-titanium photovoltaic support is larger than or equal to 650 MPa, the tensile strength is larger than or equal to 780 MPa, and the percentage elongation after fracture is larger than or equal to 18%; the salt spray corrosion rate is smaller than or equal to 0.05 mm / a, the pitting potential is larger than or equal to 0.85 V, an intergranular corrosion test has no tendency, the cost is reduced through waste steel, and the method is suitable for industrial production and has good application prospects in the field of photovoltaic support materials.

The application provides a gas cooled reactor nuclear power unit secondary loop and oxygenation treatment method, and relates to the technical field of oxygenation treatment of a gas cooled reactor nuclear power unit secondary loop. The oxygenation treatment method of the gas cooled reactor nuclear power unit secondary loop comprises a post-starting feedwater oxygenation conversion stage, a normal operation oxygenation control stage and a pre-shutdown feedwater oxygenation conversion stage. The oxygenation treatment method of the gas cooled reactor nuclear power unit secondary loop can effectively prevent dissolved oxygen from entering a steam generator heat transfer pipe during the starting and stopping stages, thereby avoiding intergranular corrosion and stress corrosion of the steam generator nickel-based alloy caused by the synergistic effect of dissolved oxygen and high-concentration anions.

The invention provides a Z2CN19-10 + N2 forge piece for nuclear power, which is prepared from the following components in percentage by weight: 0.01 to 0.02 percent of C, 0.90 to 1.00 percent of Si, 1.90 to 2.00 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 18.50 to 20.00 percent of Cr, 9.00 to 10.00 percent of Ni, 0.90 to 1.00 percent of Cu, less than or equal to 0.0015 percent of Bi, 0.05 to 0.08 percent of N, 0.04 to 0.05 percent of Co, 0.05 to 0.08 percent of Nb, 0.07 to 0.10 percent of Ta and the balance of iron. The invention further provides a manufacturing method of the Z2CN19-10 + N2 forge piece for nuclear power. The Z2CN19-10 + N2 forge piece for nuclear power, provided by the invention, has relatively good intergranular corrosion resistance and hardenability.

An alloy material that has excellent intergranular corrosion resistance is provided. An alloy material according to the present disclosure has a chemical composition containing, in mass %, C: 0.005 to 0.020%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.030% or less, S: 0.0100% or less, Cu: 1.5 to 3.0%, Ni: 35.0 to 50.0%, Cr: 20.0 to 30.0%, Mo: 2.5 to 4.0%, Co: 0.01 to 0.80%, W: 0.01 to 0.30%, Ca: 0.0050% or less, N: 0.001 to 0.015%, Al: 0.20% or less, B: 0.0030% or less, Sn: 0.050% or less, and Ti: 0.40 to 0.90%, with the balance being Fe and impurities, in which the total content of Ti, Nb, V, Zr, Hf, and Ta is 0.420 to 1.000%. The number density of fine nitrogen-containing precipitates at grain boundaries of the alloy material is 20 / μm or less.

Described herein are 6xxx series aluminum alloys which exhibit high corrosion resistance while maintaining high strength-to-weight ratio, formability, and weldability. The 6xxx series aluminum alloys include Cr to improve intergranular corrosion resistance while maintaining high strength and formability. 6xxx series aluminum alloys including Cr in amount from 0.05 wt. % to 0.50 wt. % improved IGC resistance. The Cr addition in 6xxx series aluminum alloys improves the corrosion resistance of aluminum alloy products formed from the aluminum alloy without causing a substantial loss in strength.

The present invention relates to the technical field of ferritic stainless steel, specifically an annealing method for improving the intergranular corrosion resistance of super ferritic stainless steel. To address the problem of how to improve the recrystallization annealing process to enhance the intergranular corrosion resistance of stainless steel plates while maintaining fine grains, a novel annealing method for improving the intergranular corrosion resistance of super ferritic stainless steel is provided. The method comprises three continuous annealing stages: a pre-precipitation annealing to pre-precipitate a nanoscale Laves phase; a recrystallization annealing to pin grain boundaries and refine grains; and finally, a resolubility annealing to dissolve the Laves phase at high temperature, dissolving Nb, Mo, and Si elements near the grain boundaries and precipitating Nb (C, N) particles. The drag effect of the solute Nb, Mo, and Si suppresses grain coarsening, thereby enhancing the intergranular corrosion resistance of the super ferritic stainless steel while maintaining fine grains and ensuring its mechanical properties.

The present invention provides a corrosion-resistant high-strength duplex stainless steel, comprising, by weight percentage: C 0.09% to 0.14%, Si ≤ 0.80%, Mn ≤ 0.80%, P ≤ 0.035%, S ≤ 0.030%, Cr 20.00% to 22.00%, Ni 4.80% to 5.80%, 0 < Mo ≤ 0.20%, Ti 0.35% to 0.65%, 0 < Al ≤ 0.13%, 0 < N ≤ 0.035%, with the remainder being iron and unavoidable impurities. The present invention also provides a method for preparing the corrosion-resistant high-strength duplex stainless steel, comprising: (1) smelting to obtain a steel ingot; (2) performing upsetting, drawing and forging on the steel ingot to obtain an intermediate billet; (3) performing a staged heat treatment on the intermediate billet, and then cooling. The corrosion-resistant high-strength duplex stainless steel provided by the present invention has significantly improved hot working properties and excellent intergranular corrosion resistance.